Gas off-take pipe for fuel-distillation retorts and coke ovens



W. MUELLER GAS OFF TAKE PIPE FOR FUEL DISTILLATION RETOHTS AND COKE OVENS Filed Nov. 50, 1925 WITNESSES M INVENTOR VI ZZheZImMZjZjI:

BY flw ATTORNEYS wxazf 649 3? Patented Aug. 2%,

srarns PATENT WILHELM -MUELLER, OF GLEIWI'IZ, GERMANY Application filed November 30, 1925, Serial No. 72,369, and in Germany January 8, 1925.

My invention refers to improvements in gas off-take pipes for retort ovens or coke ovens for the distillation of coal and other fuel.

t is well-known that, owing to the high 5 temperature at which the evolved gases pass from the retort or coke ovens through the ascending off-take pipes into the gas collecting mains, graphite or tar crusts are deposited in the pipes and subsequently hardened by the hot gases in the last period of gasification. These crusts become thicker in course of time, The internal diameter of the pipe becoming smaller, and the gas draft is throttled, causing loss of gas and decomposition of the byproducts. it is only with diiiiculty that it is possible to remove these graphite crusts with chisels or scrapers during the working and an adequate staff of workmen must be kept in attendance. Should the crusts become too thick. the pipes must be removed and the graphite cut out or burnt away, and not infrequently in such cases the pipes break or become damaged and have to be replaced by new ones.

The present invention is directed and has for its object to overcome these disadvantages.

According to this invention, gas ofi-take pipes for fuel distillation retorts or coke ovens are provided with longitudinal ribs or the like in the inner surfaces of the said pipes.

The accompanying drawings represent an example of the application of the present invention.

Fig. 1 is a sectional elevation of an ascension pipe from an oven to the gas collecting main or receiver.

Fig. 2 is a cross-section taken on line 2-2 Fig. 1.

Fig. 3 is a cross section of an alternative construction of a pipe with rounded internal rib faces.

As illustrated in Figs. 1 and 2; the vertical riser pipe C which constitutes a gas off-take from a coke oven E to a gas main F ispro vided on its inner surface with longitudinally disposed angular ribs R. In Fig. 3 the internal surface of the pipe is of undulatory form in cross-section by reason of the rounded ribs B In both forms the effect of these ribs is that the graphite crusts which settle on the inner surface of the pipe wall and gradually build up, cannot form a closed ring externally of the inner diameter of the ribs which thereby serve to divide the ring into segments, whereby the formation of graphite and tar crusts is not actually prevented, but the scales, which are divided or weakened in several places, while still thin, by the ribs, become loose and drop into the oven, or retort. Incrustations which form on the inner faces of the ribs and join the thicker segments be tween the ribs, are weak, structurally, and will break when the off-take pipe expands, as it does at every discharge of the coke ovens, so that the segments are loosened thereby and will drop into the oven.

In manufacturing new pipes, the ribs R or B may be cast integral with the pipe Walls. But existing smooth round pipes, however, may also be provided with ribs by simply fixing the triangular or rounded ribs of rolled iron bars or the like with a few stud-bolts or in a similar manner to the inner surface of the said pipe walls.

Having now fully described and ascertained my said invention, I declare that what I claim is:

1. lhe combination with a coke oven and a gas ofii-take therefrom including a vertical riser pipe, of annularly spaced longitudinally and continuously extending ribs formed upon the interior of said pipe.

2. The combination with a coke oven and a gas ofi-take therefrom including a vertical riser pipe, of annularly spaced longitudinally extending ribs on the internal surface of the pipe having a wedge shape in section.

3. A gas off-take for fuel distillation retorts, comprisinga pipe adapted to be disposed vertically and provided on its inner face with a plurality of annularly spaced longitudinally extending ribs having inward-- ly converging sides.

In testimony whereof I affix my signatur a.

WI'LHELM MUELLER 

